Refactor notify_service specs

- Use it_behaves_like instead of include_examples.
- Remove some extra whitespace.

ee/spec/services/projects/prometheus/alerts/notify_service_spec.rb

@@ -183,11 +183,7 @@ describe Projects::Prometheus::Alerts::NotifyService do
     context 'no incident_management license' do
       before do
         create(:prometheus_service, project: project)
-
-        create(:project_alerting_setting,
-          project: project,
-          token: token)
-
+        create(:project_alerting_setting, project: project, token: token)
         create(:project_incident_management_setting, send_email: false, project: project)
 
         allow(project).to receive(:feature_available?).and_call_original
@@ -195,16 +191,13 @@ describe Projects::Prometheus::Alerts::NotifyService do
           .with(:incident_management).and_return(false)
       end
 
-      include_examples 'notifies alerts'
+      it_behaves_like 'notifies alerts'
     end
 
     context 'with incident_management license' do
       before do
         create(:prometheus_service, project: project)
-
-        create(:project_alerting_setting,
-          project: project,
-          token: token)
+        create(:project_alerting_setting, project: project, token: token)
 
         allow(project).to receive(:feature_available?).and_call_original
         allow(project).to receive(:feature_available?)
@@ -212,7 +205,7 @@ describe Projects::Prometheus::Alerts::NotifyService do
       end
 
       context 'when incident_management_setting does not exist' do
-        include_examples 'notifies alerts'
+        it_behaves_like 'notifies alerts'
       end
 
       context 'when incident_management_setting.send_email is true' do
@@ -220,11 +213,11 @@ describe Projects::Prometheus::Alerts::NotifyService do
           create(:project_incident_management_setting, send_email: true, project: project)
         end
 
-        include_examples 'notifies alerts'
+        it_behaves_like 'notifies alerts'
       end
 
       context 'incident_management_setting.send_email is false' do
-        before do
+        let(:incident_mgmt_settings) do
           create(:project_incident_management_setting, send_email: false, project: project)
         end
 
@@ -232,7 +225,8 @@ describe Projects::Prometheus::Alerts::NotifyService do
 
         it 'does not send notification' do
           expect(project.feature_available?(:incident_management)).to eq(true)
-          expect(project).to receive(:incident_management_setting).and_call_original
+          expect(project).to receive(:incident_management_setting).and_return(incident_mgmt_settings)
+          expect(incident_mgmt_settings).to receive(:send_email)
           expect(NotificationService).not_to receive(:new)
 
           expect(subject).to eq(true)